Cleaner and dust-collector.



J. P. STOFFEL.

CLEANER AND DUST COLLECTOR.

APPLICATION HLED JAN- 25. I916' Patented July 25, 1916.

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r srarns JOHN P. STOFFEL, 015 LOS ANGELES, CALIFORNIA.

CLEANER AND DUST-COLLECTOR.

Specification of Letters Patent.

Patented July 25, 1916.

Application filedJanuary 25, 1916. Serial No. 74,158.

To all whom it may concern: y I

Be it known that 1, JOHN P. S'r orrnn, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles,

and State of California, have invented new and useful Improvements in Cleaners and Dust-Collectors, of which the following is a specification.

This invention relates toa cleaner and dust collector, and particularly pertains to a device which is especially adapted for use in flour mills and the like for cleaning the screens commonly employed in separating air and dust.

It is the object ofthis invention to provide a means for vibrating or shaking air screens to prevent the accumulation of'dust and dust collecting action. 7

Another object is to provide a device which is especially applicable for use in conjunction with tubular screens and particularly to those that are vertically arranged.

Another object is to provide means whereby the screen may be shaken by the movement of the oscillating or reciprocating Sifters now commonly employed in milling operations, thus utilizing the movement of a necessarily movable element of the millto.

thereon and thereby facilitate the screening effect the shaking of the screen, thereby,

economizing power.

A further object is to provide a mechanisin ofthe above character which is simple in construction and arrangement of parts and which can be readily, and economically installed.

The inventionis illustrated in the accompanying drawings in which: t s

Figure 1 is a view of the. cleaner and dust collector in front elevation with parts broken away. Fig. .2 is a view in vertical sectionand elevation asdscen on the line 22 of Fig. 1, in the direction indicated by the arrows. Fig; 3 is a detail in perspective showing the manner of mounting the cleaner. p

More specifically, referencebeing had to Fig. 2, ,5 indicates an air and dust conduit leading from any suitable source ofsupply, which connectswith a distributing housing 6 of any suitable construction through a flexible tube 7. The housing 6 is here shown as rectangular in form and as car: ried on res lient hangers 8 pending from a support 9; thehangers 8 belng adapted to be vibrated as will be later described, to impart a shakin motion to the housing 6 and its connections. Thehousing 6 is formed with a series of discharge openings 10 on its under side which openingsare surrounded by flanges 11 carried on the under side of the housing and forming throats to which dependent tubular screens 12 are attached. The screens 12 are formed of fabric or other suitable material and are preferably flexible. The lower ends of the tubular screens 12 connect with collars 13 on a hopper housing 14 having inlet openings 15 on'its upper wall which communicate with the interiors of the screens 12. The hopper housing 14 is here shown as carried on the frame 16 of an oscillating or reciprocating sifter 17, the endsof which sifter are carried by the flexible hangers 8 as is common in mill construction. This connection is devised as a means for imparting a shaking motion to the screens 12 from the movement of the shifter. The bottom of the hopper housing 14L is formed by canted floors l8swhich' lead toa discharge opening 19 communicating with a flexible tube 20 leading to a dust collect ing casing 21 inwhich a worm conveyer 22 is mounted. The casing 21 1s fitted with a damper 23 arranged adjacent a discharge opening 2 1 in the bottom of the casing which damper serves to regulate the discharge of the dust from the casing 21.

An important feature of this invention resides in a, means for shaking or vibrating the screen ducts 12 independent of their movement as effected by the sifter. This means embodies a flexible cleaning member 25 whichpreferably consistsof a chain and which extends longitudinally of the screen duct 12 onthe interior thereof, as shown in Fig. 2. The cleaner 25 extends substantially throughout the length of theduct and its upper end is connected to a flexible strap 26. This strap is preferably formed of leather or similar material and extends through the discharge opening 10 and throat 11 forming a swinging support for the cleaner 25 and at the same time serving as a means for preventing the cleaner from striking the walls of the opening 10 and throat 11 as would be the case were the chain extended therethrough. The upper end of the strap 26 is here shown as affixed to a block 27 which seats on 'a flange 28 carried on the upper Wall of the housing 6;

The flange 28 is here shown as encircled by a cylindrical wall 29, the upper end of which is closed by a cap 30.

The cleaner- 25 may be readily removed and replaced through the opening surrounded by the flange 28; the cap 30 being removed for this purpose.

In the operation of'the invention air coir the collecting housing 14 thus separating the dust and air. The dust will be delivered from. the housing 14 to the casing 21 through the tube 20 from Whenceit is discharged by the conveyer 22 through the opening 24.

The passage of the air through the walls of the screen ducts tends to deposit dust on the inner faces of the ducts which clog the latter and restrict the flow of airv there through. Byv the use of the present invention this latterdifiiculty is obviated in the following manner: On movement of the sifter the screen ducts 12 are shifted laterally causing the cleaner 25 to impact against the screen ducts, thus vibrating same and causing the dust particles accumulated on the inner walls thereof and tending to cling thereto, to fall and be carried into the collecting housing. This agitation of the screen-ducts maintains them comparatively free of dust, thus facilitating the passage of,

air therethrough and hastening theseparating operation.

While I have shown the screen ducts as shifted through the medium of the sifter, lt'lS manifest that any other means may be employed for effecting this movement, the

present arrangement, however, being desirable in that the one operating mechanism by which the sifter is actuated will serve to V perform the function of moving theducts.

7 What I claim is:

1. In a dust collector, the combination with a movable sifter, of a distributing housing, means for delivering airand dust to said housing, a receiving'housing carried by the sifter, a screen duct having its upper end opening to the interior of the distributingho'using and its lower end opening to the interior of the receiving housing, and means within said duct for impacting same on movement being imparted to the sifter.

' 2. In a dust collector, the combination with a movable sifter, of a distributing housing, means for delivering air and dust to said housing, a receiving housing carried by the sifter, a plurality of screen ducts having their upper ends opening to the interior of the distributing housing and their lower ends opening to the interior of the receiving housing, and depending chains within the ducts. V

8. In a dust collector, a distributing housing having discharge apertures in its lower wall, screen ducts depending from said housing and opening thereto through the discharge apertures, a flexible strap depending through the discharge apertures, and chains suspended from said straps within the ducts, adapted to impact the walls of the ducts on movement of same.

4. In a dust collector,'a distributing housing having a discharge opening in its lower wall and an opening in its upper wall opposite the discharge opening, a strap depend ing through said openings, means for detachably supporting said strap, a chain de pending from the lower end of thestrap, and a screen duct communicating at its upper endwith the discharge opening and in which the chain is arranged". V H

5. In a dust collector, a distributing housing having a discharge opening in its bottom,

a strap depending from said block and extending through the discharge openlng, a' cha1n depending from sald strap, and: a

screen duct encompassing the chain and communicating wlth the dlscharge opening.

6. In a dust collector,a distributing housing having discharge openings formed therein, means for delivering air and dust to the interior of said housing, screen ducts depending from saidhousing communicating to the interior thereof through the discharge openings, flexible straps carried by said housing extending through the discharge openings, chains depending from said straps into the interior of the ducts, and means for shaking the ducts to cause the chains to impact against the walls thereof. g

7. In a dust collector, the combination with a movable sifter and hangers connected to said sifter, of a distributing housing carried by said hangers, means for delivering air and dust to said housing, a-receiving housing carried by the sifter frame, a plurality of screen ducts having their upper ends opening to theinterior of the distributing housing and their lower ends opening to the interior of the receiving housing, and 7 means within said ducts for impacting same on movement being impartedto the sifter.

8. In a dust collector, the combination with a movable sifter and hangers connected to said sifter, of a distributing housing'carried by said hangers, means for delivering air and dust to said housing, a receiving housing carried by the sifter frame, a plurality of screen ducts having their upper ends opening to the interior of the distributing housing and theirlower ends opening to the interior of the receiving housing, and means Within said ducts for impacting same 011 movement being imparted to the Sifter, said means comprising chains dependent Within the ducts. 1

9. In a dust collector, a distributing housing having a discharge opening on its lower Wall, a screen duct connecting With said opening at its upper end, and depending 10 from the housing, an annular flange on the housing, a block adapted to seat on said flange, a strap depending from said block, and a chain aflixed to said strap extending into the duct.

10. In a dust collector, a housing, a screen duct depending therefrom, an annular flange carried by the housing, a block adapted to seat on said flange, and a chain depending from said block extending into the duct.

In testimony'whereof I have signed my name to this specification.

JOHN P. STOFF'EL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

